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libsoup CVE-2026-15713

| EUVDEUVD-2026-44429 MEDIUM
Missing Release of Resource after Effective Lifetime (CWE-772)
2026-07-14 redhat GHSA-wr2r-8grw-r4x2
Denial Of Service Red Hat Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Suse Red Hat
5.9
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
5.9 MEDIUM

DoS-only OOM impact maps to A:H; no confidentiality or integrity effect; AC:H reflects sustained, condition-specific HTTP/2 stream manipulation required.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.9 LOW
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Jul 22, 2026 - 14:04 vuln.today
CVE Published
Jul 14, 2026 - 19:45 nvd
MEDIUM 5.9

DescriptionCVE.org

A vulnerability was found in libsoup's HTTP/2 protocol implementation. The library fails to correctly release memory context blocks under specific stream termination conditions, such as when an HTTP/2 connection encounters window exhaustion or explicit stream resets. A remote, unauthenticated attacker acting as a malicious network peer can trick the connection engine into allocating stream states that are subsequently leaked during cleanup. Over a sustained period, this flaw allows the remote attacker to consume the system's heap allocations incrementally, triggering a denial of service (DoS) through an ultimate Out-of-Memory (OOM) application crash.

AnalysisAI

Memory leak in libsoup's HTTP/2 implementation allows a remote, unauthenticated attacker to incrementally exhaust heap memory and crash the affected application through a sustained out-of-memory condition. Affected deployments include any application linking libsoup on Red Hat Enterprise Linux 6 through 10 that handles HTTP/2 connections from untrusted peers. No public exploit code has been identified and CISA has not listed this in KEV; however, the network-accessible attack surface with no authentication requirement makes it relevant for internet-facing services using libsoup. Notably, the provided CVSS vector (C:H/I:N/A:N) is internally inconsistent with the DoS-only description - the correct impact metrics should reflect Availability, not Confidentiality, and this discrepancy is flagged in the risk assessment.

Technical ContextAI

libsoup is the GNOME project's HTTP client/server library, widely used by GNOME desktop applications, Evolution mail client, and server-side components on Linux. The vulnerability resides in its HTTP/2 protocol implementation, specifically in stream lifecycle management. CWE-772 (Missing Release of Resource after Effective Lifetime) identifies the root cause: allocated memory context blocks representing HTTP/2 stream state are not released when a stream terminates under edge-case conditions - specifically window exhaustion (flow control limits reached) and explicit RST_STREAM frames. Each such termination leaks a small allocation; over many connections or frames this compounds into heap exhaustion. The CPE data confirms affected platforms are Red Hat Enterprise Linux versions 6, 7, 8, 9, and 10, reported directly by Red Hat, with the upstream bug tracked at GNOME GitLab work item 541.

RemediationAI

Apply the updated libsoup package provided by Red Hat for the applicable RHEL version via standard package management (yum/dnf update libsoup). The exact patched package version is not confirmed in the available data - consult https://access.redhat.com/security/cve/CVE-2026-15713 for the specific errata and version. As a compensating control where patching is not immediately possible, consider restricting HTTP/2 access from untrusted network peers at the perimeter firewall or load balancer, forcing HTTP/1.1 negotiation where the application supports protocol downgrade - note this may impact performance for clients relying on HTTP/2 multiplexing. Process-level memory limits (ulimit or systemd MemoryMax) can slow but not prevent OOM progression and introduce their own crash risk. Application-layer rate limiting on new connection establishment per source IP reduces attacker throughput at the cost of potentially affecting legitimate high-volume clients.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-15713 vulnerability details – vuln.today
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